cpus: extract out TCG-specific code to accel/tcg
TCG is the first accelerator to register a "CpusAccel" interface on initialization, providing functions for starting a vcpu, kicking a vcpu, sychronizing state and getting virtual clock and ticks. Signed-off-by: Claudio Fontana <cfontana@suse.de> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> [added const] Signed-off-by: Claudio Fontana <cfontana@suse.de> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
parent
430065dab0
commit
a77dabc33b
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@ -12,4 +12,4 @@ tcg_ss.add(when: 'CONFIG_SOFTMMU', if_false: files('user-exec-stub.c'))
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tcg_ss.add(when: 'CONFIG_PLUGIN', if_true: [files('plugin-gen.c'), libdl])
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tcg_ss.add(when: 'CONFIG_PLUGIN', if_true: [files('plugin-gen.c'), libdl])
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specific_ss.add_all(when: 'CONFIG_TCG', if_true: tcg_ss)
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specific_ss.add_all(when: 'CONFIG_TCG', if_true: tcg_ss)
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specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TCG'], if_true: files('tcg-all.c', 'cputlb.c'))
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specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TCG'], if_true: files('tcg-all.c', 'cputlb.c', 'tcg-cpus.c'))
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@ -24,18 +24,15 @@
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*/
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*/
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#include "qemu/osdep.h"
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#include "qemu/osdep.h"
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#include "sysemu/accel.h"
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#include "qemu-common.h"
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#include "sysemu/tcg.h"
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#include "sysemu/tcg.h"
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#include "qom/object.h"
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#include "cpu.h"
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#include "sysemu/cpus.h"
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#include "sysemu/cpu-timers.h"
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#include "sysemu/cpu-timers.h"
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#include "qemu/main-loop.h"
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#include "tcg/tcg.h"
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#include "tcg/tcg.h"
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#include "qapi/error.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/error-report.h"
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#include "hw/boards.h"
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#include "hw/boards.h"
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#include "qapi/qapi-builtin-visit.h"
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#include "qapi/qapi-builtin-visit.h"
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#include "tcg-cpus.h"
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struct TCGState {
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struct TCGState {
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AccelState parent_obj;
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AccelState parent_obj;
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@ -124,6 +121,8 @@ static void tcg_accel_instance_init(Object *obj)
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s->mttcg_enabled = default_mttcg_enabled();
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s->mttcg_enabled = default_mttcg_enabled();
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}
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}
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bool mttcg_enabled;
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static int tcg_init(MachineState *ms)
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static int tcg_init(MachineState *ms)
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{
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{
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TCGState *s = TCG_STATE(current_accel());
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TCGState *s = TCG_STATE(current_accel());
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@ -131,6 +130,8 @@ static int tcg_init(MachineState *ms)
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tcg_exec_init(s->tb_size * 1024 * 1024);
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tcg_exec_init(s->tb_size * 1024 * 1024);
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cpu_interrupt_handler = tcg_handle_interrupt;
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cpu_interrupt_handler = tcg_handle_interrupt;
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mttcg_enabled = s->mttcg_enabled;
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mttcg_enabled = s->mttcg_enabled;
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cpus_register_accel(&tcg_cpus);
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return 0;
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return 0;
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}
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}
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@ -0,0 +1,551 @@
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/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2014 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "sysemu/tcg.h"
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#include "sysemu/replay.h"
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#include "qemu/main-loop.h"
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#include "qemu/guest-random.h"
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#include "exec/exec-all.h"
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#include "hw/boards.h"
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#include "tcg-cpus.h"
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/* Kick all RR vCPUs */
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static void qemu_cpu_kick_rr_cpus(void)
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{
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CPUState *cpu;
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CPU_FOREACH(cpu) {
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cpu_exit(cpu);
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};
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}
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static void tcg_kick_vcpu_thread(CPUState *cpu)
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{
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if (qemu_tcg_mttcg_enabled()) {
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cpu_exit(cpu);
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} else {
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qemu_cpu_kick_rr_cpus();
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}
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}
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/*
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* TCG vCPU kick timer
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*
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* The kick timer is responsible for moving single threaded vCPU
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* emulation on to the next vCPU. If more than one vCPU is running a
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* timer event with force a cpu->exit so the next vCPU can get
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* scheduled.
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*
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* The timer is removed if all vCPUs are idle and restarted again once
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* idleness is complete.
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*/
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static QEMUTimer *tcg_kick_vcpu_timer;
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static CPUState *tcg_current_rr_cpu;
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#define TCG_KICK_PERIOD (NANOSECONDS_PER_SECOND / 10)
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static inline int64_t qemu_tcg_next_kick(void)
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{
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return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + TCG_KICK_PERIOD;
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}
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/* Kick the currently round-robin scheduled vCPU to next */
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static void qemu_cpu_kick_rr_next_cpu(void)
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{
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CPUState *cpu;
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do {
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cpu = qatomic_mb_read(&tcg_current_rr_cpu);
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if (cpu) {
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cpu_exit(cpu);
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}
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} while (cpu != qatomic_mb_read(&tcg_current_rr_cpu));
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}
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static void kick_tcg_thread(void *opaque)
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{
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timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick());
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qemu_cpu_kick_rr_next_cpu();
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}
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static void start_tcg_kick_timer(void)
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{
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assert(!mttcg_enabled);
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if (!tcg_kick_vcpu_timer && CPU_NEXT(first_cpu)) {
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tcg_kick_vcpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
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kick_tcg_thread, NULL);
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}
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if (tcg_kick_vcpu_timer && !timer_pending(tcg_kick_vcpu_timer)) {
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timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick());
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}
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}
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static void stop_tcg_kick_timer(void)
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{
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assert(!mttcg_enabled);
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if (tcg_kick_vcpu_timer && timer_pending(tcg_kick_vcpu_timer)) {
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timer_del(tcg_kick_vcpu_timer);
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}
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}
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static void qemu_tcg_destroy_vcpu(CPUState *cpu)
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{
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}
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static void qemu_tcg_rr_wait_io_event(void)
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{
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CPUState *cpu;
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while (all_cpu_threads_idle()) {
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stop_tcg_kick_timer();
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qemu_cond_wait_iothread(first_cpu->halt_cond);
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}
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start_tcg_kick_timer();
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CPU_FOREACH(cpu) {
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qemu_wait_io_event_common(cpu);
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}
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}
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static int64_t tcg_get_icount_limit(void)
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{
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int64_t deadline;
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if (replay_mode != REPLAY_MODE_PLAY) {
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/*
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* Include all the timers, because they may need an attention.
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* Too long CPU execution may create unnecessary delay in UI.
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*/
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deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
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QEMU_TIMER_ATTR_ALL);
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/* Check realtime timers, because they help with input processing */
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deadline = qemu_soonest_timeout(deadline,
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qemu_clock_deadline_ns_all(QEMU_CLOCK_REALTIME,
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QEMU_TIMER_ATTR_ALL));
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/*
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* Maintain prior (possibly buggy) behaviour where if no deadline
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* was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
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* INT32_MAX nanoseconds ahead, we still use INT32_MAX
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* nanoseconds.
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*/
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if ((deadline < 0) || (deadline > INT32_MAX)) {
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deadline = INT32_MAX;
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}
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return icount_round(deadline);
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} else {
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return replay_get_instructions();
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}
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}
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static void notify_aio_contexts(void)
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{
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/* Wake up other AioContexts. */
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qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
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qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
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}
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static void handle_icount_deadline(void)
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{
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assert(qemu_in_vcpu_thread());
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if (icount_enabled()) {
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int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
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QEMU_TIMER_ATTR_ALL);
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if (deadline == 0) {
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notify_aio_contexts();
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}
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}
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}
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static void prepare_icount_for_run(CPUState *cpu)
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{
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if (icount_enabled()) {
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int insns_left;
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/*
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* These should always be cleared by process_icount_data after
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* each vCPU execution. However u16.high can be raised
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* asynchronously by cpu_exit/cpu_interrupt/tcg_handle_interrupt
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*/
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g_assert(cpu_neg(cpu)->icount_decr.u16.low == 0);
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g_assert(cpu->icount_extra == 0);
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cpu->icount_budget = tcg_get_icount_limit();
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insns_left = MIN(0xffff, cpu->icount_budget);
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cpu_neg(cpu)->icount_decr.u16.low = insns_left;
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cpu->icount_extra = cpu->icount_budget - insns_left;
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replay_mutex_lock();
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if (cpu->icount_budget == 0 && replay_has_checkpoint()) {
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notify_aio_contexts();
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}
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}
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}
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static void process_icount_data(CPUState *cpu)
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{
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if (icount_enabled()) {
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/* Account for executed instructions */
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icount_update(cpu);
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/* Reset the counters */
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cpu_neg(cpu)->icount_decr.u16.low = 0;
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cpu->icount_extra = 0;
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cpu->icount_budget = 0;
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replay_account_executed_instructions();
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replay_mutex_unlock();
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}
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}
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static int tcg_cpu_exec(CPUState *cpu)
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{
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int ret;
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#ifdef CONFIG_PROFILER
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int64_t ti;
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#endif
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assert(tcg_enabled());
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#ifdef CONFIG_PROFILER
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ti = profile_getclock();
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#endif
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cpu_exec_start(cpu);
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ret = cpu_exec(cpu);
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cpu_exec_end(cpu);
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#ifdef CONFIG_PROFILER
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qatomic_set(&tcg_ctx->prof.cpu_exec_time,
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tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti);
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#endif
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return ret;
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}
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/*
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* Destroy any remaining vCPUs which have been unplugged and have
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* finished running
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*/
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static void deal_with_unplugged_cpus(void)
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{
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CPUState *cpu;
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CPU_FOREACH(cpu) {
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if (cpu->unplug && !cpu_can_run(cpu)) {
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qemu_tcg_destroy_vcpu(cpu);
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cpu_thread_signal_destroyed(cpu);
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break;
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}
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}
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}
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/*
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* Single-threaded TCG
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*
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* In the single-threaded case each vCPU is simulated in turn. If
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* there is more than a single vCPU we create a simple timer to kick
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* the vCPU and ensure we don't get stuck in a tight loop in one vCPU.
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* This is done explicitly rather than relying on side-effects
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* elsewhere.
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*/
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static void *tcg_rr_cpu_thread_fn(void *arg)
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{
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CPUState *cpu = arg;
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assert(tcg_enabled());
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rcu_register_thread();
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tcg_register_thread();
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qemu_mutex_lock_iothread();
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qemu_thread_get_self(cpu->thread);
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cpu->thread_id = qemu_get_thread_id();
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cpu->can_do_io = 1;
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cpu_thread_signal_created(cpu);
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qemu_guest_random_seed_thread_part2(cpu->random_seed);
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/* wait for initial kick-off after machine start */
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while (first_cpu->stopped) {
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qemu_cond_wait_iothread(first_cpu->halt_cond);
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/* process any pending work */
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CPU_FOREACH(cpu) {
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current_cpu = cpu;
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qemu_wait_io_event_common(cpu);
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}
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}
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start_tcg_kick_timer();
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cpu = first_cpu;
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/* process any pending work */
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cpu->exit_request = 1;
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while (1) {
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qemu_mutex_unlock_iothread();
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replay_mutex_lock();
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qemu_mutex_lock_iothread();
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/* Account partial waits to QEMU_CLOCK_VIRTUAL. */
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icount_account_warp_timer();
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|
||||||
|
/*
|
||||||
|
* Run the timers here. This is much more efficient than
|
||||||
|
* waking up the I/O thread and waiting for completion.
|
||||||
|
*/
|
||||||
|
handle_icount_deadline();
|
||||||
|
|
||||||
|
replay_mutex_unlock();
|
||||||
|
|
||||||
|
if (!cpu) {
|
||||||
|
cpu = first_cpu;
|
||||||
|
}
|
||||||
|
|
||||||
|
while (cpu && cpu_work_list_empty(cpu) && !cpu->exit_request) {
|
||||||
|
|
||||||
|
qatomic_mb_set(&tcg_current_rr_cpu, cpu);
|
||||||
|
current_cpu = cpu;
|
||||||
|
|
||||||
|
qemu_clock_enable(QEMU_CLOCK_VIRTUAL,
|
||||||
|
(cpu->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
||||||
|
|
||||||
|
if (cpu_can_run(cpu)) {
|
||||||
|
int r;
|
||||||
|
|
||||||
|
qemu_mutex_unlock_iothread();
|
||||||
|
prepare_icount_for_run(cpu);
|
||||||
|
|
||||||
|
r = tcg_cpu_exec(cpu);
|
||||||
|
|
||||||
|
process_icount_data(cpu);
|
||||||
|
qemu_mutex_lock_iothread();
|
||||||
|
|
||||||
|
if (r == EXCP_DEBUG) {
|
||||||
|
cpu_handle_guest_debug(cpu);
|
||||||
|
break;
|
||||||
|
} else if (r == EXCP_ATOMIC) {
|
||||||
|
qemu_mutex_unlock_iothread();
|
||||||
|
cpu_exec_step_atomic(cpu);
|
||||||
|
qemu_mutex_lock_iothread();
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
} else if (cpu->stop) {
|
||||||
|
if (cpu->unplug) {
|
||||||
|
cpu = CPU_NEXT(cpu);
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
cpu = CPU_NEXT(cpu);
|
||||||
|
} /* while (cpu && !cpu->exit_request).. */
|
||||||
|
|
||||||
|
/* Does not need qatomic_mb_set because a spurious wakeup is okay. */
|
||||||
|
qatomic_set(&tcg_current_rr_cpu, NULL);
|
||||||
|
|
||||||
|
if (cpu && cpu->exit_request) {
|
||||||
|
qatomic_mb_set(&cpu->exit_request, 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (icount_enabled() && all_cpu_threads_idle()) {
|
||||||
|
/*
|
||||||
|
* When all cpus are sleeping (e.g in WFI), to avoid a deadlock
|
||||||
|
* in the main_loop, wake it up in order to start the warp timer.
|
||||||
|
*/
|
||||||
|
qemu_notify_event();
|
||||||
|
}
|
||||||
|
|
||||||
|
qemu_tcg_rr_wait_io_event();
|
||||||
|
deal_with_unplugged_cpus();
|
||||||
|
}
|
||||||
|
|
||||||
|
rcu_unregister_thread();
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Multi-threaded TCG
|
||||||
|
*
|
||||||
|
* In the multi-threaded case each vCPU has its own thread. The TLS
|
||||||
|
* variable current_cpu can be used deep in the code to find the
|
||||||
|
* current CPUState for a given thread.
|
||||||
|
*/
|
||||||
|
|
||||||
|
static void *tcg_cpu_thread_fn(void *arg)
|
||||||
|
{
|
||||||
|
CPUState *cpu = arg;
|
||||||
|
|
||||||
|
assert(tcg_enabled());
|
||||||
|
g_assert(!icount_enabled());
|
||||||
|
|
||||||
|
rcu_register_thread();
|
||||||
|
tcg_register_thread();
|
||||||
|
|
||||||
|
qemu_mutex_lock_iothread();
|
||||||
|
qemu_thread_get_self(cpu->thread);
|
||||||
|
|
||||||
|
cpu->thread_id = qemu_get_thread_id();
|
||||||
|
cpu->can_do_io = 1;
|
||||||
|
current_cpu = cpu;
|
||||||
|
cpu_thread_signal_created(cpu);
|
||||||
|
qemu_guest_random_seed_thread_part2(cpu->random_seed);
|
||||||
|
|
||||||
|
/* process any pending work */
|
||||||
|
cpu->exit_request = 1;
|
||||||
|
|
||||||
|
do {
|
||||||
|
if (cpu_can_run(cpu)) {
|
||||||
|
int r;
|
||||||
|
qemu_mutex_unlock_iothread();
|
||||||
|
r = tcg_cpu_exec(cpu);
|
||||||
|
qemu_mutex_lock_iothread();
|
||||||
|
switch (r) {
|
||||||
|
case EXCP_DEBUG:
|
||||||
|
cpu_handle_guest_debug(cpu);
|
||||||
|
break;
|
||||||
|
case EXCP_HALTED:
|
||||||
|
/*
|
||||||
|
* during start-up the vCPU is reset and the thread is
|
||||||
|
* kicked several times. If we don't ensure we go back
|
||||||
|
* to sleep in the halted state we won't cleanly
|
||||||
|
* start-up when the vCPU is enabled.
|
||||||
|
*
|
||||||
|
* cpu->halted should ensure we sleep in wait_io_event
|
||||||
|
*/
|
||||||
|
g_assert(cpu->halted);
|
||||||
|
break;
|
||||||
|
case EXCP_ATOMIC:
|
||||||
|
qemu_mutex_unlock_iothread();
|
||||||
|
cpu_exec_step_atomic(cpu);
|
||||||
|
qemu_mutex_lock_iothread();
|
||||||
|
default:
|
||||||
|
/* Ignore everything else? */
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
qatomic_mb_set(&cpu->exit_request, 0);
|
||||||
|
qemu_wait_io_event(cpu);
|
||||||
|
} while (!cpu->unplug || cpu_can_run(cpu));
|
||||||
|
|
||||||
|
qemu_tcg_destroy_vcpu(cpu);
|
||||||
|
cpu_thread_signal_destroyed(cpu);
|
||||||
|
qemu_mutex_unlock_iothread();
|
||||||
|
rcu_unregister_thread();
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void tcg_start_vcpu_thread(CPUState *cpu)
|
||||||
|
{
|
||||||
|
char thread_name[VCPU_THREAD_NAME_SIZE];
|
||||||
|
static QemuCond *single_tcg_halt_cond;
|
||||||
|
static QemuThread *single_tcg_cpu_thread;
|
||||||
|
static int tcg_region_inited;
|
||||||
|
|
||||||
|
assert(tcg_enabled());
|
||||||
|
/*
|
||||||
|
* Initialize TCG regions--once. Now is a good time, because:
|
||||||
|
* (1) TCG's init context, prologue and target globals have been set up.
|
||||||
|
* (2) qemu_tcg_mttcg_enabled() works now (TCG init code runs before the
|
||||||
|
* -accel flag is processed, so the check doesn't work then).
|
||||||
|
*/
|
||||||
|
if (!tcg_region_inited) {
|
||||||
|
tcg_region_inited = 1;
|
||||||
|
tcg_region_init();
|
||||||
|
/*
|
||||||
|
* If MTTCG, and we will create multiple cpus,
|
||||||
|
* then we will have cpus running in parallel.
|
||||||
|
*/
|
||||||
|
if (qemu_tcg_mttcg_enabled()) {
|
||||||
|
MachineState *ms = MACHINE(qdev_get_machine());
|
||||||
|
if (ms->smp.max_cpus > 1) {
|
||||||
|
parallel_cpus = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) {
|
||||||
|
cpu->thread = g_malloc0(sizeof(QemuThread));
|
||||||
|
cpu->halt_cond = g_malloc0(sizeof(QemuCond));
|
||||||
|
qemu_cond_init(cpu->halt_cond);
|
||||||
|
|
||||||
|
if (qemu_tcg_mttcg_enabled()) {
|
||||||
|
/* create a thread per vCPU with TCG (MTTCG) */
|
||||||
|
snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG",
|
||||||
|
cpu->cpu_index);
|
||||||
|
|
||||||
|
qemu_thread_create(cpu->thread, thread_name, tcg_cpu_thread_fn,
|
||||||
|
cpu, QEMU_THREAD_JOINABLE);
|
||||||
|
|
||||||
|
} else {
|
||||||
|
/* share a single thread for all cpus with TCG */
|
||||||
|
snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG");
|
||||||
|
qemu_thread_create(cpu->thread, thread_name,
|
||||||
|
tcg_rr_cpu_thread_fn,
|
||||||
|
cpu, QEMU_THREAD_JOINABLE);
|
||||||
|
|
||||||
|
single_tcg_halt_cond = cpu->halt_cond;
|
||||||
|
single_tcg_cpu_thread = cpu->thread;
|
||||||
|
}
|
||||||
|
#ifdef _WIN32
|
||||||
|
cpu->hThread = qemu_thread_get_handle(cpu->thread);
|
||||||
|
#endif
|
||||||
|
} else {
|
||||||
|
/* For non-MTTCG cases we share the thread */
|
||||||
|
cpu->thread = single_tcg_cpu_thread;
|
||||||
|
cpu->halt_cond = single_tcg_halt_cond;
|
||||||
|
cpu->thread_id = first_cpu->thread_id;
|
||||||
|
cpu->can_do_io = 1;
|
||||||
|
cpu->created = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static int64_t tcg_get_virtual_clock(void)
|
||||||
|
{
|
||||||
|
if (icount_enabled()) {
|
||||||
|
return icount_get();
|
||||||
|
}
|
||||||
|
return cpu_get_clock();
|
||||||
|
}
|
||||||
|
|
||||||
|
static int64_t tcg_get_elapsed_ticks(void)
|
||||||
|
{
|
||||||
|
if (icount_enabled()) {
|
||||||
|
return icount_get();
|
||||||
|
}
|
||||||
|
return cpu_get_ticks();
|
||||||
|
}
|
||||||
|
|
||||||
|
const CpusAccel tcg_cpus = {
|
||||||
|
.create_vcpu_thread = tcg_start_vcpu_thread,
|
||||||
|
.kick_vcpu_thread = tcg_kick_vcpu_thread,
|
||||||
|
.get_virtual_clock = tcg_get_virtual_clock,
|
||||||
|
.get_elapsed_ticks = tcg_get_elapsed_ticks,
|
||||||
|
};
|
|
@ -0,0 +1,17 @@
|
||||||
|
/*
|
||||||
|
* Accelerator CPUS Interface
|
||||||
|
*
|
||||||
|
* Copyright 2020 SUSE LLC
|
||||||
|
*
|
||||||
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
||||||
|
* See the COPYING file in the top-level directory.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef TCG_CPUS_H
|
||||||
|
#define TCG_CPUS_H
|
||||||
|
|
||||||
|
#include "sysemu/cpus.h"
|
||||||
|
|
||||||
|
extern const CpusAccel tcg_cpus;
|
||||||
|
|
||||||
|
#endif /* TCG_CPUS_H */
|
505
softmmu/cpus.c
505
softmmu/cpus.c
|
@ -24,27 +24,19 @@
|
||||||
|
|
||||||
#include "qemu/osdep.h"
|
#include "qemu/osdep.h"
|
||||||
#include "qemu-common.h"
|
#include "qemu-common.h"
|
||||||
#include "qemu/config-file.h"
|
|
||||||
#include "qemu/cutils.h"
|
|
||||||
#include "migration/vmstate.h"
|
|
||||||
#include "monitor/monitor.h"
|
#include "monitor/monitor.h"
|
||||||
#include "qapi/error.h"
|
#include "qapi/error.h"
|
||||||
#include "qapi/qapi-commands-misc.h"
|
#include "qapi/qapi-commands-misc.h"
|
||||||
#include "qapi/qapi-events-run-state.h"
|
#include "qapi/qapi-events-run-state.h"
|
||||||
#include "qapi/qmp/qerror.h"
|
#include "qapi/qmp/qerror.h"
|
||||||
#include "qemu/error-report.h"
|
|
||||||
#include "qemu/qemu-print.h"
|
|
||||||
#include "sysemu/tcg.h"
|
#include "sysemu/tcg.h"
|
||||||
#include "sysemu/block-backend.h"
|
|
||||||
#include "exec/gdbstub.h"
|
#include "exec/gdbstub.h"
|
||||||
#include "sysemu/dma.h"
|
|
||||||
#include "sysemu/hw_accel.h"
|
#include "sysemu/hw_accel.h"
|
||||||
#include "sysemu/kvm.h"
|
#include "sysemu/kvm.h"
|
||||||
#include "sysemu/hax.h"
|
#include "sysemu/hax.h"
|
||||||
#include "sysemu/hvf.h"
|
#include "sysemu/hvf.h"
|
||||||
#include "sysemu/whpx.h"
|
#include "sysemu/whpx.h"
|
||||||
#include "exec/exec-all.h"
|
#include "exec/exec-all.h"
|
||||||
|
|
||||||
#include "qemu/thread.h"
|
#include "qemu/thread.h"
|
||||||
#include "qemu/plugin.h"
|
#include "qemu/plugin.h"
|
||||||
#include "sysemu/cpus.h"
|
#include "sysemu/cpus.h"
|
||||||
|
@ -124,79 +116,6 @@ bool all_cpu_threads_idle(void)
|
||||||
return true;
|
return true;
|
||||||
}
|
}
|
||||||
|
|
||||||
bool mttcg_enabled;
|
|
||||||
|
|
||||||
|
|
||||||
/***********************************************************/
|
|
||||||
/* TCG vCPU kick timer
|
|
||||||
*
|
|
||||||
* The kick timer is responsible for moving single threaded vCPU
|
|
||||||
* emulation on to the next vCPU. If more than one vCPU is running a
|
|
||||||
* timer event with force a cpu->exit so the next vCPU can get
|
|
||||||
* scheduled.
|
|
||||||
*
|
|
||||||
* The timer is removed if all vCPUs are idle and restarted again once
|
|
||||||
* idleness is complete.
|
|
||||||
*/
|
|
||||||
|
|
||||||
static QEMUTimer *tcg_kick_vcpu_timer;
|
|
||||||
static CPUState *tcg_current_rr_cpu;
|
|
||||||
|
|
||||||
#define TCG_KICK_PERIOD (NANOSECONDS_PER_SECOND / 10)
|
|
||||||
|
|
||||||
static inline int64_t qemu_tcg_next_kick(void)
|
|
||||||
{
|
|
||||||
return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + TCG_KICK_PERIOD;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Kick the currently round-robin scheduled vCPU to next */
|
|
||||||
static void qemu_cpu_kick_rr_next_cpu(void)
|
|
||||||
{
|
|
||||||
CPUState *cpu;
|
|
||||||
do {
|
|
||||||
cpu = qatomic_mb_read(&tcg_current_rr_cpu);
|
|
||||||
if (cpu) {
|
|
||||||
cpu_exit(cpu);
|
|
||||||
}
|
|
||||||
} while (cpu != qatomic_mb_read(&tcg_current_rr_cpu));
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Kick all RR vCPUs */
|
|
||||||
static void qemu_cpu_kick_rr_cpus(void)
|
|
||||||
{
|
|
||||||
CPUState *cpu;
|
|
||||||
|
|
||||||
CPU_FOREACH(cpu) {
|
|
||||||
cpu_exit(cpu);
|
|
||||||
};
|
|
||||||
}
|
|
||||||
|
|
||||||
static void kick_tcg_thread(void *opaque)
|
|
||||||
{
|
|
||||||
timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick());
|
|
||||||
qemu_cpu_kick_rr_next_cpu();
|
|
||||||
}
|
|
||||||
|
|
||||||
static void start_tcg_kick_timer(void)
|
|
||||||
{
|
|
||||||
assert(!mttcg_enabled);
|
|
||||||
if (!tcg_kick_vcpu_timer && CPU_NEXT(first_cpu)) {
|
|
||||||
tcg_kick_vcpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
|
|
||||||
kick_tcg_thread, NULL);
|
|
||||||
}
|
|
||||||
if (tcg_kick_vcpu_timer && !timer_pending(tcg_kick_vcpu_timer)) {
|
|
||||||
timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick());
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void stop_tcg_kick_timer(void)
|
|
||||||
{
|
|
||||||
assert(!mttcg_enabled);
|
|
||||||
if (tcg_kick_vcpu_timer && timer_pending(tcg_kick_vcpu_timer)) {
|
|
||||||
timer_del(tcg_kick_vcpu_timer);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/***********************************************************/
|
/***********************************************************/
|
||||||
void hw_error(const char *fmt, ...)
|
void hw_error(const char *fmt, ...)
|
||||||
{
|
{
|
||||||
|
@ -328,9 +247,7 @@ int64_t cpus_get_virtual_clock(void)
|
||||||
if (cpus_accel && cpus_accel->get_virtual_clock) {
|
if (cpus_accel && cpus_accel->get_virtual_clock) {
|
||||||
return cpus_accel->get_virtual_clock();
|
return cpus_accel->get_virtual_clock();
|
||||||
}
|
}
|
||||||
if (icount_enabled()) {
|
if (qtest_enabled()) { /* for qtest_clock_warp */
|
||||||
return icount_get();
|
|
||||||
} else if (qtest_enabled()) { /* for qtest_clock_warp */
|
|
||||||
return qtest_get_virtual_clock();
|
return qtest_get_virtual_clock();
|
||||||
}
|
}
|
||||||
return cpu_get_clock();
|
return cpu_get_clock();
|
||||||
|
@ -346,9 +263,6 @@ int64_t cpus_get_elapsed_ticks(void)
|
||||||
if (cpus_accel && cpus_accel->get_elapsed_ticks) {
|
if (cpus_accel && cpus_accel->get_elapsed_ticks) {
|
||||||
return cpus_accel->get_elapsed_ticks();
|
return cpus_accel->get_elapsed_ticks();
|
||||||
}
|
}
|
||||||
if (icount_enabled()) {
|
|
||||||
return icount_get();
|
|
||||||
}
|
|
||||||
return cpu_get_ticks();
|
return cpu_get_ticks();
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -482,10 +396,6 @@ static void qemu_kvm_destroy_vcpu(CPUState *cpu)
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
static void qemu_tcg_destroy_vcpu(CPUState *cpu)
|
|
||||||
{
|
|
||||||
}
|
|
||||||
|
|
||||||
static void qemu_cpu_stop(CPUState *cpu, bool exit)
|
static void qemu_cpu_stop(CPUState *cpu, bool exit)
|
||||||
{
|
{
|
||||||
g_assert(qemu_cpu_is_self(cpu));
|
g_assert(qemu_cpu_is_self(cpu));
|
||||||
|
@ -506,22 +416,6 @@ void qemu_wait_io_event_common(CPUState *cpu)
|
||||||
process_queued_cpu_work(cpu);
|
process_queued_cpu_work(cpu);
|
||||||
}
|
}
|
||||||
|
|
||||||
static void qemu_tcg_rr_wait_io_event(void)
|
|
||||||
{
|
|
||||||
CPUState *cpu;
|
|
||||||
|
|
||||||
while (all_cpu_threads_idle()) {
|
|
||||||
stop_tcg_kick_timer();
|
|
||||||
qemu_cond_wait(first_cpu->halt_cond, &qemu_global_mutex);
|
|
||||||
}
|
|
||||||
|
|
||||||
start_tcg_kick_timer();
|
|
||||||
|
|
||||||
CPU_FOREACH(cpu) {
|
|
||||||
qemu_wait_io_event_common(cpu);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
void qemu_wait_io_event(CPUState *cpu)
|
void qemu_wait_io_event(CPUState *cpu)
|
||||||
{
|
{
|
||||||
bool slept = false;
|
bool slept = false;
|
||||||
|
@ -633,259 +527,6 @@ static void *qemu_dummy_cpu_thread_fn(void *arg)
|
||||||
#endif
|
#endif
|
||||||
}
|
}
|
||||||
|
|
||||||
static int64_t tcg_get_icount_limit(void)
|
|
||||||
{
|
|
||||||
int64_t deadline;
|
|
||||||
|
|
||||||
if (replay_mode != REPLAY_MODE_PLAY) {
|
|
||||||
/*
|
|
||||||
* Include all the timers, because they may need an attention.
|
|
||||||
* Too long CPU execution may create unnecessary delay in UI.
|
|
||||||
*/
|
|
||||||
deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
|
|
||||||
QEMU_TIMER_ATTR_ALL);
|
|
||||||
/* Check realtime timers, because they help with input processing */
|
|
||||||
deadline = qemu_soonest_timeout(deadline,
|
|
||||||
qemu_clock_deadline_ns_all(QEMU_CLOCK_REALTIME,
|
|
||||||
QEMU_TIMER_ATTR_ALL));
|
|
||||||
|
|
||||||
/* Maintain prior (possibly buggy) behaviour where if no deadline
|
|
||||||
* was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
|
|
||||||
* INT32_MAX nanoseconds ahead, we still use INT32_MAX
|
|
||||||
* nanoseconds.
|
|
||||||
*/
|
|
||||||
if ((deadline < 0) || (deadline > INT32_MAX)) {
|
|
||||||
deadline = INT32_MAX;
|
|
||||||
}
|
|
||||||
|
|
||||||
return icount_round(deadline);
|
|
||||||
} else {
|
|
||||||
return replay_get_instructions();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void notify_aio_contexts(void)
|
|
||||||
{
|
|
||||||
/* Wake up other AioContexts. */
|
|
||||||
qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
|
|
||||||
qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
|
|
||||||
}
|
|
||||||
|
|
||||||
static void handle_icount_deadline(void)
|
|
||||||
{
|
|
||||||
assert(qemu_in_vcpu_thread());
|
|
||||||
if (icount_enabled()) {
|
|
||||||
int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
|
|
||||||
QEMU_TIMER_ATTR_ALL);
|
|
||||||
|
|
||||||
if (deadline == 0) {
|
|
||||||
notify_aio_contexts();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void prepare_icount_for_run(CPUState *cpu)
|
|
||||||
{
|
|
||||||
if (icount_enabled()) {
|
|
||||||
int insns_left;
|
|
||||||
|
|
||||||
/* These should always be cleared by process_icount_data after
|
|
||||||
* each vCPU execution. However u16.high can be raised
|
|
||||||
* asynchronously by cpu_exit/cpu_interrupt/tcg_handle_interrupt
|
|
||||||
*/
|
|
||||||
g_assert(cpu_neg(cpu)->icount_decr.u16.low == 0);
|
|
||||||
g_assert(cpu->icount_extra == 0);
|
|
||||||
|
|
||||||
cpu->icount_budget = tcg_get_icount_limit();
|
|
||||||
insns_left = MIN(0xffff, cpu->icount_budget);
|
|
||||||
cpu_neg(cpu)->icount_decr.u16.low = insns_left;
|
|
||||||
cpu->icount_extra = cpu->icount_budget - insns_left;
|
|
||||||
|
|
||||||
replay_mutex_lock();
|
|
||||||
|
|
||||||
if (cpu->icount_budget == 0 && replay_has_checkpoint()) {
|
|
||||||
notify_aio_contexts();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void process_icount_data(CPUState *cpu)
|
|
||||||
{
|
|
||||||
if (icount_enabled()) {
|
|
||||||
/* Account for executed instructions */
|
|
||||||
icount_update(cpu);
|
|
||||||
|
|
||||||
/* Reset the counters */
|
|
||||||
cpu_neg(cpu)->icount_decr.u16.low = 0;
|
|
||||||
cpu->icount_extra = 0;
|
|
||||||
cpu->icount_budget = 0;
|
|
||||||
|
|
||||||
replay_account_executed_instructions();
|
|
||||||
|
|
||||||
replay_mutex_unlock();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
static int tcg_cpu_exec(CPUState *cpu)
|
|
||||||
{
|
|
||||||
int ret;
|
|
||||||
#ifdef CONFIG_PROFILER
|
|
||||||
int64_t ti;
|
|
||||||
#endif
|
|
||||||
|
|
||||||
assert(tcg_enabled());
|
|
||||||
#ifdef CONFIG_PROFILER
|
|
||||||
ti = profile_getclock();
|
|
||||||
#endif
|
|
||||||
cpu_exec_start(cpu);
|
|
||||||
ret = cpu_exec(cpu);
|
|
||||||
cpu_exec_end(cpu);
|
|
||||||
#ifdef CONFIG_PROFILER
|
|
||||||
qatomic_set(&tcg_ctx->prof.cpu_exec_time,
|
|
||||||
tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti);
|
|
||||||
#endif
|
|
||||||
return ret;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Destroy any remaining vCPUs which have been unplugged and have
|
|
||||||
* finished running
|
|
||||||
*/
|
|
||||||
static void deal_with_unplugged_cpus(void)
|
|
||||||
{
|
|
||||||
CPUState *cpu;
|
|
||||||
|
|
||||||
CPU_FOREACH(cpu) {
|
|
||||||
if (cpu->unplug && !cpu_can_run(cpu)) {
|
|
||||||
qemu_tcg_destroy_vcpu(cpu);
|
|
||||||
cpu_thread_signal_destroyed(cpu);
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Single-threaded TCG
|
|
||||||
*
|
|
||||||
* In the single-threaded case each vCPU is simulated in turn. If
|
|
||||||
* there is more than a single vCPU we create a simple timer to kick
|
|
||||||
* the vCPU and ensure we don't get stuck in a tight loop in one vCPU.
|
|
||||||
* This is done explicitly rather than relying on side-effects
|
|
||||||
* elsewhere.
|
|
||||||
*/
|
|
||||||
|
|
||||||
static void *qemu_tcg_rr_cpu_thread_fn(void *arg)
|
|
||||||
{
|
|
||||||
CPUState *cpu = arg;
|
|
||||||
|
|
||||||
assert(tcg_enabled());
|
|
||||||
rcu_register_thread();
|
|
||||||
tcg_register_thread();
|
|
||||||
|
|
||||||
qemu_mutex_lock_iothread();
|
|
||||||
qemu_thread_get_self(cpu->thread);
|
|
||||||
|
|
||||||
cpu->thread_id = qemu_get_thread_id();
|
|
||||||
cpu->can_do_io = 1;
|
|
||||||
cpu_thread_signal_created(cpu);
|
|
||||||
qemu_guest_random_seed_thread_part2(cpu->random_seed);
|
|
||||||
|
|
||||||
/* wait for initial kick-off after machine start */
|
|
||||||
while (first_cpu->stopped) {
|
|
||||||
qemu_cond_wait(first_cpu->halt_cond, &qemu_global_mutex);
|
|
||||||
|
|
||||||
/* process any pending work */
|
|
||||||
CPU_FOREACH(cpu) {
|
|
||||||
current_cpu = cpu;
|
|
||||||
qemu_wait_io_event_common(cpu);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
start_tcg_kick_timer();
|
|
||||||
|
|
||||||
cpu = first_cpu;
|
|
||||||
|
|
||||||
/* process any pending work */
|
|
||||||
cpu->exit_request = 1;
|
|
||||||
|
|
||||||
while (1) {
|
|
||||||
qemu_mutex_unlock_iothread();
|
|
||||||
replay_mutex_lock();
|
|
||||||
qemu_mutex_lock_iothread();
|
|
||||||
/* Account partial waits to QEMU_CLOCK_VIRTUAL. */
|
|
||||||
icount_account_warp_timer();
|
|
||||||
|
|
||||||
/* Run the timers here. This is much more efficient than
|
|
||||||
* waking up the I/O thread and waiting for completion.
|
|
||||||
*/
|
|
||||||
handle_icount_deadline();
|
|
||||||
|
|
||||||
replay_mutex_unlock();
|
|
||||||
|
|
||||||
if (!cpu) {
|
|
||||||
cpu = first_cpu;
|
|
||||||
}
|
|
||||||
|
|
||||||
while (cpu && cpu_work_list_empty(cpu) && !cpu->exit_request) {
|
|
||||||
|
|
||||||
qatomic_mb_set(&tcg_current_rr_cpu, cpu);
|
|
||||||
current_cpu = cpu;
|
|
||||||
|
|
||||||
qemu_clock_enable(QEMU_CLOCK_VIRTUAL,
|
|
||||||
(cpu->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
|
||||||
|
|
||||||
if (cpu_can_run(cpu)) {
|
|
||||||
int r;
|
|
||||||
|
|
||||||
qemu_mutex_unlock_iothread();
|
|
||||||
prepare_icount_for_run(cpu);
|
|
||||||
|
|
||||||
r = tcg_cpu_exec(cpu);
|
|
||||||
|
|
||||||
process_icount_data(cpu);
|
|
||||||
qemu_mutex_lock_iothread();
|
|
||||||
|
|
||||||
if (r == EXCP_DEBUG) {
|
|
||||||
cpu_handle_guest_debug(cpu);
|
|
||||||
break;
|
|
||||||
} else if (r == EXCP_ATOMIC) {
|
|
||||||
qemu_mutex_unlock_iothread();
|
|
||||||
cpu_exec_step_atomic(cpu);
|
|
||||||
qemu_mutex_lock_iothread();
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
} else if (cpu->stop) {
|
|
||||||
if (cpu->unplug) {
|
|
||||||
cpu = CPU_NEXT(cpu);
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
|
|
||||||
cpu = CPU_NEXT(cpu);
|
|
||||||
} /* while (cpu && !cpu->exit_request).. */
|
|
||||||
|
|
||||||
/* Does not need qatomic_mb_set because a spurious wakeup is okay. */
|
|
||||||
qatomic_set(&tcg_current_rr_cpu, NULL);
|
|
||||||
|
|
||||||
if (cpu && cpu->exit_request) {
|
|
||||||
qatomic_mb_set(&cpu->exit_request, 0);
|
|
||||||
}
|
|
||||||
|
|
||||||
if (icount_enabled() && all_cpu_threads_idle()) {
|
|
||||||
/*
|
|
||||||
* When all cpus are sleeping (e.g in WFI), to avoid a deadlock
|
|
||||||
* in the main_loop, wake it up in order to start the warp timer.
|
|
||||||
*/
|
|
||||||
qemu_notify_event();
|
|
||||||
}
|
|
||||||
|
|
||||||
qemu_tcg_rr_wait_io_event();
|
|
||||||
deal_with_unplugged_cpus();
|
|
||||||
}
|
|
||||||
|
|
||||||
rcu_unregister_thread();
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
static void *qemu_hax_cpu_thread_fn(void *arg)
|
static void *qemu_hax_cpu_thread_fn(void *arg)
|
||||||
{
|
{
|
||||||
CPUState *cpu = arg;
|
CPUState *cpu = arg;
|
||||||
|
@ -1005,76 +646,6 @@ static void CALLBACK dummy_apc_func(ULONG_PTR unused)
|
||||||
}
|
}
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
/* Multi-threaded TCG
|
|
||||||
*
|
|
||||||
* In the multi-threaded case each vCPU has its own thread. The TLS
|
|
||||||
* variable current_cpu can be used deep in the code to find the
|
|
||||||
* current CPUState for a given thread.
|
|
||||||
*/
|
|
||||||
|
|
||||||
static void *qemu_tcg_cpu_thread_fn(void *arg)
|
|
||||||
{
|
|
||||||
CPUState *cpu = arg;
|
|
||||||
|
|
||||||
assert(tcg_enabled());
|
|
||||||
g_assert(!icount_enabled());
|
|
||||||
|
|
||||||
rcu_register_thread();
|
|
||||||
tcg_register_thread();
|
|
||||||
|
|
||||||
qemu_mutex_lock_iothread();
|
|
||||||
qemu_thread_get_self(cpu->thread);
|
|
||||||
|
|
||||||
cpu->thread_id = qemu_get_thread_id();
|
|
||||||
cpu->can_do_io = 1;
|
|
||||||
current_cpu = cpu;
|
|
||||||
cpu_thread_signal_created(cpu);
|
|
||||||
qemu_guest_random_seed_thread_part2(cpu->random_seed);
|
|
||||||
|
|
||||||
/* process any pending work */
|
|
||||||
cpu->exit_request = 1;
|
|
||||||
|
|
||||||
do {
|
|
||||||
if (cpu_can_run(cpu)) {
|
|
||||||
int r;
|
|
||||||
qemu_mutex_unlock_iothread();
|
|
||||||
r = tcg_cpu_exec(cpu);
|
|
||||||
qemu_mutex_lock_iothread();
|
|
||||||
switch (r) {
|
|
||||||
case EXCP_DEBUG:
|
|
||||||
cpu_handle_guest_debug(cpu);
|
|
||||||
break;
|
|
||||||
case EXCP_HALTED:
|
|
||||||
/* during start-up the vCPU is reset and the thread is
|
|
||||||
* kicked several times. If we don't ensure we go back
|
|
||||||
* to sleep in the halted state we won't cleanly
|
|
||||||
* start-up when the vCPU is enabled.
|
|
||||||
*
|
|
||||||
* cpu->halted should ensure we sleep in wait_io_event
|
|
||||||
*/
|
|
||||||
g_assert(cpu->halted);
|
|
||||||
break;
|
|
||||||
case EXCP_ATOMIC:
|
|
||||||
qemu_mutex_unlock_iothread();
|
|
||||||
cpu_exec_step_atomic(cpu);
|
|
||||||
qemu_mutex_lock_iothread();
|
|
||||||
default:
|
|
||||||
/* Ignore everything else? */
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
qatomic_mb_set(&cpu->exit_request, 0);
|
|
||||||
qemu_wait_io_event(cpu);
|
|
||||||
} while (!cpu->unplug || cpu_can_run(cpu));
|
|
||||||
|
|
||||||
qemu_tcg_destroy_vcpu(cpu);
|
|
||||||
cpu_thread_signal_destroyed(cpu);
|
|
||||||
qemu_mutex_unlock_iothread();
|
|
||||||
rcu_unregister_thread();
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
void cpus_kick_thread(CPUState *cpu)
|
void cpus_kick_thread(CPUState *cpu)
|
||||||
{
|
{
|
||||||
#ifndef _WIN32
|
#ifndef _WIN32
|
||||||
|
@ -1105,15 +676,8 @@ void cpus_kick_thread(CPUState *cpu)
|
||||||
void qemu_cpu_kick(CPUState *cpu)
|
void qemu_cpu_kick(CPUState *cpu)
|
||||||
{
|
{
|
||||||
qemu_cond_broadcast(cpu->halt_cond);
|
qemu_cond_broadcast(cpu->halt_cond);
|
||||||
|
|
||||||
if (cpus_accel && cpus_accel->kick_vcpu_thread) {
|
if (cpus_accel && cpus_accel->kick_vcpu_thread) {
|
||||||
cpus_accel->kick_vcpu_thread(cpu);
|
cpus_accel->kick_vcpu_thread(cpu);
|
||||||
} else if (tcg_enabled()) {
|
|
||||||
if (qemu_tcg_mttcg_enabled()) {
|
|
||||||
cpu_exit(cpu);
|
|
||||||
} else {
|
|
||||||
qemu_cpu_kick_rr_cpus();
|
|
||||||
}
|
|
||||||
} else {
|
} else {
|
||||||
if (hax_enabled()) {
|
if (hax_enabled()) {
|
||||||
/*
|
/*
|
||||||
|
@ -1269,71 +833,6 @@ void cpu_remove_sync(CPUState *cpu)
|
||||||
qemu_mutex_lock_iothread();
|
qemu_mutex_lock_iothread();
|
||||||
}
|
}
|
||||||
|
|
||||||
static void qemu_tcg_init_vcpu(CPUState *cpu)
|
|
||||||
{
|
|
||||||
char thread_name[VCPU_THREAD_NAME_SIZE];
|
|
||||||
static QemuCond *single_tcg_halt_cond;
|
|
||||||
static QemuThread *single_tcg_cpu_thread;
|
|
||||||
static int tcg_region_inited;
|
|
||||||
|
|
||||||
assert(tcg_enabled());
|
|
||||||
/*
|
|
||||||
* Initialize TCG regions--once. Now is a good time, because:
|
|
||||||
* (1) TCG's init context, prologue and target globals have been set up.
|
|
||||||
* (2) qemu_tcg_mttcg_enabled() works now (TCG init code runs before the
|
|
||||||
* -accel flag is processed, so the check doesn't work then).
|
|
||||||
*/
|
|
||||||
if (!tcg_region_inited) {
|
|
||||||
tcg_region_inited = 1;
|
|
||||||
tcg_region_init();
|
|
||||||
/*
|
|
||||||
* If MTTCG, and we will create multiple cpus,
|
|
||||||
* then we will have cpus running in parallel.
|
|
||||||
*/
|
|
||||||
if (qemu_tcg_mttcg_enabled()) {
|
|
||||||
MachineState *ms = MACHINE(qdev_get_machine());
|
|
||||||
if (ms->smp.max_cpus > 1) {
|
|
||||||
parallel_cpus = true;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) {
|
|
||||||
cpu->thread = g_malloc0(sizeof(QemuThread));
|
|
||||||
cpu->halt_cond = g_malloc0(sizeof(QemuCond));
|
|
||||||
qemu_cond_init(cpu->halt_cond);
|
|
||||||
|
|
||||||
if (qemu_tcg_mttcg_enabled()) {
|
|
||||||
/* create a thread per vCPU with TCG (MTTCG) */
|
|
||||||
snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG",
|
|
||||||
cpu->cpu_index);
|
|
||||||
|
|
||||||
qemu_thread_create(cpu->thread, thread_name, qemu_tcg_cpu_thread_fn,
|
|
||||||
cpu, QEMU_THREAD_JOINABLE);
|
|
||||||
|
|
||||||
} else {
|
|
||||||
/* share a single thread for all cpus with TCG */
|
|
||||||
snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG");
|
|
||||||
qemu_thread_create(cpu->thread, thread_name,
|
|
||||||
qemu_tcg_rr_cpu_thread_fn,
|
|
||||||
cpu, QEMU_THREAD_JOINABLE);
|
|
||||||
|
|
||||||
single_tcg_halt_cond = cpu->halt_cond;
|
|
||||||
single_tcg_cpu_thread = cpu->thread;
|
|
||||||
}
|
|
||||||
#ifdef _WIN32
|
|
||||||
cpu->hThread = qemu_thread_get_handle(cpu->thread);
|
|
||||||
#endif
|
|
||||||
} else {
|
|
||||||
/* For non-MTTCG cases we share the thread */
|
|
||||||
cpu->thread = single_tcg_cpu_thread;
|
|
||||||
cpu->halt_cond = single_tcg_halt_cond;
|
|
||||||
cpu->thread_id = first_cpu->thread_id;
|
|
||||||
cpu->can_do_io = 1;
|
|
||||||
cpu->created = true;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void qemu_hax_start_vcpu(CPUState *cpu)
|
static void qemu_hax_start_vcpu(CPUState *cpu)
|
||||||
{
|
{
|
||||||
char thread_name[VCPU_THREAD_NAME_SIZE];
|
char thread_name[VCPU_THREAD_NAME_SIZE];
|
||||||
|
@ -1444,8 +943,6 @@ void qemu_init_vcpu(CPUState *cpu)
|
||||||
qemu_hax_start_vcpu(cpu);
|
qemu_hax_start_vcpu(cpu);
|
||||||
} else if (hvf_enabled()) {
|
} else if (hvf_enabled()) {
|
||||||
qemu_hvf_start_vcpu(cpu);
|
qemu_hvf_start_vcpu(cpu);
|
||||||
} else if (tcg_enabled()) {
|
|
||||||
qemu_tcg_init_vcpu(cpu);
|
|
||||||
} else if (whpx_enabled()) {
|
} else if (whpx_enabled()) {
|
||||||
qemu_whpx_start_vcpu(cpu);
|
qemu_whpx_start_vcpu(cpu);
|
||||||
} else {
|
} else {
|
||||||
|
|
Loading…
Reference in New Issue